基于数理统计的视电阻率平面图异常划分

Anomalies Division on Apparent Resistivity Plan Based on Mathematical Statistics

解释人员根据视电阻率平面图判别异常主要依赖于经验,在缺乏地质资料的勘查区,解释结果与与实际地质情况往往存在较大出入。由于同一地层的视电阻率值具有正态分布特征,因此依据测区内电测深资料和水文地质资料确定视电阻率平面图异常阈值,进而确定异常性质与范围。以黑龙江省双鸭山市某矿区2个含水层为例,采用对比方式,分析基于视电阻率值数理统计划分异常的有效性。并通过对比现有8个矿27个水文孔34个抽水层的水文地质资料和11个物探勘探区视电阻率数理统计解释结果,证实该异常划分方法可有效降低解释难度,并保证物探解释的强中弱富水区与水文地质高度吻合。

To differentiate anomalies on apparent resistivity plan by interpreters are mainly based on experiences. In prospecting areas lack of geological data, the interpreted results may differ with actual geological situation frequently. Since the apparent resistivity values of an identical stratum have normal distribution characteristics, thus, according to electrical sounding data and hydrogeological data determine anomaly threshold, then proceed to determine anomaly properties and scope. Taking the 2 aquifers in a mining area in the Shuangyashan City, Heilongjiang Province as examples, using the way of contrast, analyzed and divided anomaly validities based on mathematical statistics. Through contrast of available hydrogeological data from 34 pumping layers of 27 hydrogeological boreholes in 8mines and apparent resistivity data mathematical statistics interpreted results from 11 geophysical prospecting areas have verified the method can reduce difficulties in interpretation; to ensure geophysical interpreted different water yield property areas highly tally with hydrogeological data.